<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - geometry - text</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				font-family: Monospace;
				background-color: #000;
				color: #fff;
				margin: 0px;
				overflow: hidden;
			}
			#info {
				position: absolute;
				top: 10px;
				width: 100%;
				text-align: center;
				z-index: 100;
				display:block;
			}
			#info a, .button { color: #f00; font-weight: bold; text-decoration: underline; cursor: pointer }
		</style>
	</head>
	<body>

		<div id="info">
		<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - procedural 3D text by <a href="http://www.lab4games.net/zz85/blog" target="_blank" rel="noopener">zz85</a> &amp; alteredq
		<br/>type to enter new text, drag to spin the text
		<br/><span class="button" id="color">change color</span>,
			<span class="button" id="font">change font</span>,
			<span class="button" id="weight">change weight</span>,
			<span class="button" id="bevel">change bevel</span>
			<a id="permalink" href="#">permalink</a>
		</div>


		<script src="../build/three.js"></script>
		<script src="js/utils/GeometryUtils.js"></script>

		<script src="js/WebGL.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script>

			if ( WEBGL.isWebGLAvailable() === false ) {

				document.body.appendChild( WEBGL.getWebGLErrorMessage() );

			}

			THREE.Cache.enabled = true;

			var container, stats, permalink, hex;

			var camera, cameraTarget, scene, renderer;

			var group, textMesh1, textMesh2, textGeo, materials;

			var firstLetter = true;

			var text = "three.js",

				height = 20,
				size = 70,
				hover = 30,

				curveSegments = 4,

				bevelThickness = 2,
				bevelSize = 1.5,
				bevelEnabled = true,

				font = undefined,

				fontName = "optimer", // helvetiker, optimer, gentilis, droid sans, droid serif
				fontWeight = "bold"; // normal bold

			var mirror = true;

			var fontMap = {

				"helvetiker": 0,
				"optimer": 1,
				"gentilis": 2,
				"droid/droid_sans": 3,
				"droid/droid_serif": 4

			};

			var weightMap = {

				"regular": 0,
				"bold": 1

			};

			var reverseFontMap = [];
			var reverseWeightMap = [];

			for ( var i in fontMap ) reverseFontMap[ fontMap[ i ] ] = i;
			for ( var i in weightMap ) reverseWeightMap[ weightMap[ i ] ] = i;

			var targetRotation = 0;
			var targetRotationOnMouseDown = 0;

			var mouseX = 0;
			var mouseXOnMouseDown = 0;

			var windowHalfX = window.innerWidth / 2;

			var fontIndex = 1;

			init();
			animate();

			function decimalToHex( d ) {

				var hex = Number( d ).toString( 16 );
				hex = "000000".substr( 0, 6 - hex.length ) + hex;
				return hex.toUpperCase();

			}

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				permalink = document.getElementById( "permalink" );

				// CAMERA

				camera = new THREE.PerspectiveCamera( 30, window.innerWidth / window.innerHeight, 1, 1500 );
				camera.position.set( 0, 400, 700 );

				cameraTarget = new THREE.Vector3( 0, 150, 0 );

				// SCENE

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x000000 );
				scene.fog = new THREE.Fog( 0x000000, 250, 1400 );

				// LIGHTS

				var dirLight = new THREE.DirectionalLight( 0xffffff, 0.125 );
				dirLight.position.set( 0, 0, 1 ).normalize();
				scene.add( dirLight );

				var pointLight = new THREE.PointLight( 0xffffff, 1.5 );
				pointLight.position.set( 0, 100, 90 );
				scene.add( pointLight );

				// Get text from hash

				var hash = document.location.hash.substr( 1 );

				if ( hash.length !== 0 ) {

					var colorhash = hash.substring( 0, 6 );
					var fonthash = hash.substring( 6, 7 );
					var weighthash = hash.substring( 7, 8 );
					var bevelhash = hash.substring( 8, 9 );
					var texthash = hash.substring( 10 );

					hex = colorhash;
					pointLight.color.setHex( parseInt( colorhash, 16 ) );

					fontName = reverseFontMap[ parseInt( fonthash ) ];
					fontWeight = reverseWeightMap[ parseInt( weighthash ) ];

					bevelEnabled = parseInt( bevelhash );

					text = decodeURI( texthash );

					updatePermalink();

				} else {

					pointLight.color.setHSL( Math.random(), 1, 0.5 );
					hex = decimalToHex( pointLight.color.getHex() );

				}

				materials = [
					new THREE.MeshPhongMaterial( { color: 0xffffff, flatShading: true } ), // front
					new THREE.MeshPhongMaterial( { color: 0xffffff } ) // side
				];

				group = new THREE.Group();
				group.position.y = 100;

				scene.add( group );

				loadFont();

				var plane = new THREE.Mesh(
					new THREE.PlaneBufferGeometry( 10000, 10000 ),
					new THREE.MeshBasicMaterial( { color: 0xffffff, opacity: 0.5, transparent: true } )
				);
				plane.position.y = 100;
				plane.rotation.x = - Math.PI / 2;
				scene.add( plane );

				// RENDERER

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				// STATS

				stats = new Stats();
				//container.appendChild( stats.dom );

				// EVENTS

				document.addEventListener( 'mousedown', onDocumentMouseDown, false );
				document.addEventListener( 'touchstart', onDocumentTouchStart, false );
				document.addEventListener( 'touchmove', onDocumentTouchMove, false );
				document.addEventListener( 'keypress', onDocumentKeyPress, false );
				document.addEventListener( 'keydown', onDocumentKeyDown, false );

				document.getElementById( "color" ).addEventListener( 'click', function () {

					pointLight.color.setHSL( Math.random(), 1, 0.5 );
					hex = decimalToHex( pointLight.color.getHex() );

					updatePermalink();

				}, false );

				document.getElementById( "font" ).addEventListener( 'click', function () {

					fontIndex ++;

					fontName = reverseFontMap[ fontIndex % reverseFontMap.length ];

					loadFont();

				}, false );


				document.getElementById( "weight" ).addEventListener( 'click', function () {

					if ( fontWeight === "bold" ) {

						fontWeight = "regular";

					} else {

						fontWeight = "bold";

					}

					loadFont();

				}, false );

				document.getElementById( "bevel" ).addEventListener( 'click', function () {

					bevelEnabled = ! bevelEnabled;

					refreshText();

				}, false );

				//

				window.addEventListener( 'resize', onWindowResize, false );

			}

			function onWindowResize() {

				windowHalfX = window.innerWidth / 2;

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			//

			function boolToNum( b ) {

				return b ? 1 : 0;

			}

			function updatePermalink() {

				var link = hex + fontMap[ fontName ] + weightMap[ fontWeight ] + boolToNum( bevelEnabled ) + "#" + encodeURI( text );

				permalink.href = "#" + link;
				window.location.hash = link;

			}

			function onDocumentKeyDown( event ) {

				if ( firstLetter ) {

					firstLetter = false;
					text = "";

				}

				var keyCode = event.keyCode;

				// backspace

				if ( keyCode == 8 ) {

					event.preventDefault();

					text = text.substring( 0, text.length - 1 );
					refreshText();

					return false;

				}

			}

			function onDocumentKeyPress( event ) {

				var keyCode = event.which;

				// backspace

				if ( keyCode == 8 ) {

					event.preventDefault();

				} else {

					var ch = String.fromCharCode( keyCode );
					text += ch;

					refreshText();

				}

			}

			function loadFont() {

				var loader = new THREE.FontLoader();
				loader.load( 'fonts/' + fontName + '_' + fontWeight + '.typeface.json', function ( response ) {

					font = response;

					refreshText();

				} );

			}

			function createText() {

				textGeo = new THREE.TextGeometry( text, {

					font: font,

					size: size,
					height: height,
					curveSegments: curveSegments,

					bevelThickness: bevelThickness,
					bevelSize: bevelSize,
					bevelEnabled: bevelEnabled

				} );

				textGeo.computeBoundingBox();
				textGeo.computeVertexNormals();

				// "fix" side normals by removing z-component of normals for side faces
				// (this doesn't work well for beveled geometry as then we lose nice curvature around z-axis)

				if ( ! bevelEnabled ) {

					var triangleAreaHeuristics = 0.1 * ( height * size );

					for ( var i = 0; i < textGeo.faces.length; i ++ ) {

						var face = textGeo.faces[ i ];

						if ( face.materialIndex == 1 ) {

							for ( var j = 0; j < face.vertexNormals.length; j ++ ) {

								face.vertexNormals[ j ].z = 0;
								face.vertexNormals[ j ].normalize();

							}

							var va = textGeo.vertices[ face.a ];
							var vb = textGeo.vertices[ face.b ];
							var vc = textGeo.vertices[ face.c ];

							var s = THREE.GeometryUtils.triangleArea( va, vb, vc );

							if ( s > triangleAreaHeuristics ) {

								for ( var j = 0; j < face.vertexNormals.length; j ++ ) {

									face.vertexNormals[ j ].copy( face.normal );

								}

							}

						}

					}

				}

				var centerOffset = - 0.5 * ( textGeo.boundingBox.max.x - textGeo.boundingBox.min.x );

				textGeo = new THREE.BufferGeometry().fromGeometry( textGeo );

				textMesh1 = new THREE.Mesh( textGeo, materials );

				textMesh1.position.x = centerOffset;
				textMesh1.position.y = hover;
				textMesh1.position.z = 0;

				textMesh1.rotation.x = 0;
				textMesh1.rotation.y = Math.PI * 2;

				group.add( textMesh1 );

				if ( mirror ) {

					textMesh2 = new THREE.Mesh( textGeo, materials );

					textMesh2.position.x = centerOffset;
					textMesh2.position.y = - hover;
					textMesh2.position.z = height;

					textMesh2.rotation.x = Math.PI;
					textMesh2.rotation.y = Math.PI * 2;

					group.add( textMesh2 );

				}

			}

			function refreshText() {

				updatePermalink();

				group.remove( textMesh1 );
				if ( mirror ) group.remove( textMesh2 );

				if ( ! text ) return;

				createText();

			}

			function onDocumentMouseDown( event ) {

				event.preventDefault();

				document.addEventListener( 'mousemove', onDocumentMouseMove, false );
				document.addEventListener( 'mouseup', onDocumentMouseUp, false );
				document.addEventListener( 'mouseout', onDocumentMouseOut, false );

				mouseXOnMouseDown = event.clientX - windowHalfX;
				targetRotationOnMouseDown = targetRotation;

			}

			function onDocumentMouseMove( event ) {

				mouseX = event.clientX - windowHalfX;

				targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;

			}

			function onDocumentMouseUp() {

				document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
				document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
				document.removeEventListener( 'mouseout', onDocumentMouseOut, false );

			}

			function onDocumentMouseOut() {

				document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
				document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
				document.removeEventListener( 'mouseout', onDocumentMouseOut, false );

			}

			function onDocumentTouchStart( event ) {

				if ( event.touches.length == 1 ) {

					event.preventDefault();

					mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
					targetRotationOnMouseDown = targetRotation;

				}

			}

			function onDocumentTouchMove( event ) {

				if ( event.touches.length == 1 ) {

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;

				}

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				group.rotation.y += ( targetRotation - group.rotation.y ) * 0.05;

				camera.lookAt( cameraTarget );

				renderer.clear();
				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>
